Display Type: Standard projection televisions use 3 picture tubes of the same kind found in regular TVs reflected off an internal mirror -resulting in a bright, high contrast picture. This image is not always viewable from certain angles. Additionally, standard projection TVs are very large and may have images 'burn in' if they appear on the screen constantly. LCD Projections use a panel similar to LCD monitors, which are then magnified onto a large screen. These displays are more compact & less subject to burn-in, but may result in less brightness & darker colors may appear washed out. DLPs send light through millions of tiny mirrors to create an image -- they are compact, very bright, and have no burn-in, but may suffer from some color distortion called a 'rainbow effect'. Additionally, DLPs often require changing a lamp after a number of years. LCoS (Liquid Crystal on Silicon) TVs are similar to LCDs, but are designed in a way that allows for brighter images by combining LCD technology with DLP. It is a reflective technology that uses liquid crystals instead of individual mirrors. In terms of how the set performs, it provides a similar picture to DLPs with no rainbow effects, but possibly lower contrast. LCOS technology offers inherently high resolutions and a smoother look but lower contrast.
Aspect Ratio: TVs come primarily in two different shapes, the stardard 4:3 aspect typical of most older tube televisions, and the 16:9 widescreen format which is the standard for HDTV broadcasts.
Display Format: Analog TV signals in the US are formatted in 480i (SDTV) resolution. Each picture has 480 horizontal lines, and each frame of video is displayed in two separate halves (this is called an interlaced picture, abbreviated 'i'). SDTV sets display all signals at 480i, and generally do not receive digital TV signals. Progressive Scan DVD Players and most over-the-air digital television signals are 480p, the same resolution as standard television, but display each frame at once (called progressive picture abbreviated 'p'). EDTV sets are 480p. The best are HDTV signals, which are 1080p, 1080i or 720p resolution, the higher the resolution number, the more detailed the picture. 1080i is capable of rendering more picture detail than 720p but the 720p is clearer for rapid motion, such as football games. A true HDTV set would display at least one of the 720 or 1080 resolutions.
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